Isobaric Vapor–Liquid Equilibrium for Isopropanol + Water + 1-Ethyl-3-methylimidazolium Tetrafluoroborate

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• 作者：Qunsheng Li ; Fengying Xing ; Zhigang Lei ; Baohua Wang ; Qiulian Chang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：53
• 期：1
• 页码：275 - 279
• 全文大小：108K
• 年卷期：v.53,no.1(January 2008)
• ISSN：1520-5134

文摘

Isobaric vapor–liquid equilibrium (VLE) data for the isopropanol (1) + water (2) system containing ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]⁺[BF4]⁻) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. The results showed that the VLE of isopropanol + water in the presence of different contents of IL was obviously different from that of the IL-free system. The IL studied showed a salting-out effect, which gave rise to a change of the relative volatility of isopropanol and even to the elimination of the azeotropic point. It was found that the salting-out effect followed the order of x₃′ = 0.30 > x₃′ = 0.20 > x₃′ = 0.10, which was probably attributed to the interaction between the ions resulting from the dissociation of IL and water.